The TAJE227K016RNJ: Rated 220 µF at 16 V, this TAJ-series molded tantalum provides the bulk storage for a 12 V input rail with 4 V of headroom before the voltage rating is reached — enough margin for a 5 % nominal overvoltage without derating concerns. The ±10 % tolerance means the actual capacitance at 25 °C sits between 198 µF and 242 µF — tight enough for a bulk decoupling or output filter cap where the exact value is not a filter pole.
At 125 °C the leakage current and ESR both rise above the room-temperature values; the 500 mOhm ESR should be derated per the manufacturer's curve for hot-end ripple current.
Package and footprint — 2917 (7343 Metric)
The 7.30 mm × 4.30 mm case with a seated height of 4.30 mm (E case code) is a standard tantalum footprint — the land pattern matches the generic 2917 pad geometry used by multiple manufacturers, simplifying second-sourcing on the same board.